package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorkers {
    private static final long BEGIN_TIMESTAMP = 1735689600L;
    private static final long COUNT_BITS = 32;
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    public long nextId(String key) {
        // 1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long second = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = second - BEGIN_TIMESTAMP;
        //2.生成序列号
        //2.1 获取当前时间，精确到天
        Long count = stringRedisTemplate.opsForValue().increment("icr:" + key + ":" + now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd")));
        //2.2 自增

        //3.拼接
        return timestamp<<COUNT_BITS |count;
    }

}
